I currently have a fire going on in a house in my game. Since I don't like these particular sims, I'm going to let them burn. I got the kids out.
By the way, I figured something out (though I'm probably late to figure it out). If you don't want the sims repeatedly running to the fire, send them to another lot. They'll stay put.
EDIT: Wow. One of the two sims was actually smart enough to extinguish the flames. And it only took her two hours to figure it out!